Flowline iron
Flowline equipment for high-pressure well service
The temporary high-pressure iron that joins pumps, wellheads and manifolds on frac, flowback, cementing and well test jobs, made in AISI 4130 for union figures from 602 to 2002.
Flowline equipment, also called flow iron or treating iron, is the high-pressure pipework rigged up between pumps, manifolds and the wellhead for fracturing, flowback, cementing, acidizing and well testing, then broken down and moved to the next job. We supply the full set: hammer unions and crossovers, swivel joints, integral pup joints and hose loops, plug, check and relief valves, and positive and adjustable chokes with their beans, in AISI 4130 and other alloy steels for union figures from 602 to 2002, standard or sour service, with EN 10204 3.1 certificates.
The flowline range
Hammer unions
FIG 100 to 2002 unions with threaded, butt weld or hose ends, wing nuts and seals.
FIG 100 to 2002Crossovers and bull plugs
Crossovers between figures, sizes and threads, changeovers, bull plugs, gauge plugs and lift subs.
FIG 602 to 2002Swivel joints
Styles 10 to 80, long and short radius, union, threaded or weld ends.
1 to 4 inPup joints and hose loops
Integral and threaded pup joints, and steel hose loops of swivels and pups.
FIG 602 to 2002Plug valves
Quarter-turn plug valves with union or flanged ends for frac, cementing and well service.
1 to 4 in, to 15,000 psiCheck valves
Inline flapper, top entry and dart check valves with union ends.
1 to 4 in, to 15,000 psiRelief valves
Spring-set pressure relief valves for pump discharge and well service lines.
2 and 3 inChokes
Positive and adjustable chokes with union or API 6A flanged ends.
2 and 3 inChoke beans
Positive beans, adjustable seats and stems in steel, tungsten carbide or ceramic.
Sizes in 64thsTees, crosses, ells, laterals and long sweep ells with union ends machined from one forging are on the 4130 integral fittings page.
Choose by union figure and service
Every part in a flowline is made, rated and marked for one hammer union figure, and the figure sets the cold working pressure. These are the figures used on high-pressure iron, with the ratings union makers publish:
| Figure | Standard service | Sour gas service | Typical jobs |
|---|---|---|---|
| FIG 602 | 6,000 psi | - | Mud, cement and low-pressure test lines |
| FIG 1002 | 10,000 psi | 7,500 psi | Cementing, acidizing, well service |
| FIG 1502 | 15,000 psi | 10,000 psi | Frac, flowback, cementing and well test iron |
| FIG 2002 | 20,000 psi | - | Very high-pressure well service |
| FIG 2202 | - | 15,000 psi | High-pressure sour gas service |
Ratings as published by union makers, for example TechnipFMC for its Weco figures. The full chart, including low-pressure figures, is in hammer union figures explained.
Material, testing and marking
High-pressure flowline parts are machined from AISI 4130 forgings or bar, quenched and tempered to the strength the figure needs. For hydrogen sulfide service they are tempered to 22 HRC maximum under NACE MR0175 / ISO 15156-2, rated at the sour version of the figure and marked as sour parts.
Each part is hard stamped with the figure, size, cold working pressure and heat number, and ships with an EN 10204 3.1 certificate of chemistry, heat treatment, tensile and hardness results. Hydrostatic testing, often at 1.5 times the cold working pressure, magnetic particle inspection of threads and third-party witness are added when your order asks for them. See testing and documents.
We make these parts to the API 6A and API 16C requirements your order calls up: material, dimensions, tests and marking as specified. We do not hold an API license, so the parts do not carry the API Monogram. If your specification requires monogrammed equipment, the quotation says so plainly.
Ordering
State the product, size, union figure and end configuration (male or female), the service, the test pressure and any third-party inspection. A rig-up drawing or a line list works as well.
Integral pup joint, 3 in FIG 1502, male by female, 10 ft, AISI 4130 quenched and tempered, 15,000 psi CWP standard service, hydrostatic test at 22,500 psi, EN 10204 3.1, 8 pcs
Plug valve, 2 in, FIG 1502 male by female, sour service to NACE MR0175 / ISO 15156, 10,000 psi CWP, handle operated, EN 10204 3.1, 2 pcs